我正在使用Visual Studio 15.我的应用程序需要上传大小为6MB的文件。我正在使用带有实体框架6的.Net 4.5.1。
以下脚本和html代码是在视图级别的razor中编写的，用于选择和检查文件的上传。
$('#SaveResponse').click(function () {
var data = new FormData();
var files = $("#imagefile").get(0).files;
if (files.length > 0) {
data.append("UploadedImage", files[0]);
}
else
{
alert('You have not selected any File');
return;
}
$.ajax({
async: false,
cache: false,
type: "POST",
dataType: "json",
contentType: false,
processData: false,
url: "@(Url.RouteUrl("UploadFile"))",
data: data,
success: function (JsonCP) {
if (JsonCP.msg != null) {
if (JsonCP.msg.Key) {
alert(JsonCP.msg.Value);
$("#fileUpload").val('');
} else
alert(JsonCP.msg.Value);
}
},
error: function (JsonCP) {
alert(JsonCP.msg.Value);
}
});
});
<table>
<tr>
<td align="right" width="200px">@Html.Label("Select the File:")</td>
<td align="left" width="200px"><input type="file" id="imagefile" />
</td>
</tr>
<tr>
<td colspan="2" align="center"><input type="button" value="Save this
Response" id="SaveResponse" name="SaveResponse" /></td>
</tr>
</table>
在控制器中编写以下代码以获取要上载的文件并显示相应的消息。
[System.Web.Mvc.AcceptVerbs(HttpVerbs.Post)]
public ActionResult UploadFile()
{
UploadResponseModel rm = new UploadResponseModel();
try
{
if (System.Web.HttpContext.Current.Request.Files.AllKeys.Any())
{
var httpPostedFile =
System.Web.HttpContext.Current.Request.Files["UploadedImage"];
if (httpPostedFile != null)
{
string fileSavePath =
Path.Combine(HttpContext.Server.MapPath("~/UploadedFiles"),
Path.GetFileName(httpPostedFile.FileName));
httpPostedFile.SaveAs(fileSavePath);
rm.responseModel.response.ResponseImage =
System.IO.File.ReadAllBytes(filesavePath)
if (rm.responseModel.insertResponse() != 1)
rm.msg = new KeyValuePair<bool, string>(false,
"row is not saved successfully.");
else
rm.msg=new KeyValuePair<bool,string>(true,"File
uploaded Successfully.");
}
else
rm.msg = new KeyValuePair<bool, string>(false, "Could not
get the file.");
}
else
rm.msg = new KeyValuePair<bool, string>(false, "No file found to
Upload.");
}
catch (Exception ex)
{
rm.msg = new KeyValuePair<bool, string>(false, "Can not Upload the
file: " + ex.Message);
}
return Json(rm, JsonRequestBehavior.AllowGet);
}
}
以下函数用于在sql数据库表中插入一行名为Responses。
public int insertResponse()
{
using (Entities cntx = new Entities())
{
cntx.Responses.Add(this.response);cntx.Entry(this.response).
State = System.Data.Entity.EntityState.Added;
int ex=cntx.SaveChanges();
return ex;
}
}
响应表的一列名为responseImage，是fileStream的数据类型。它的另一列是uniqueIdentifier类型。表创建sql如下所示。
CREATE TABLE [dbo].[Responses] (
[ResponseId] UNIQUEIDENTIFIER ROWGUIDCOL NOT NULL,
[ResponseImage] VARBINARY (MAX) FILESTREAM NULL,
CONSTRAINT [PK_Responses] PRIMARY KEY CLUSTERED ([ResponseId] ASC)
FILESTREAM_ON [FileStreamGroup], UNIQUE NONCLUSTERED ([ResponseId] ASC)
);
Web confif文件设置如下
<system.web>
<authentication mode="None" />
<compilation debug="true" targetFramework="4.5.1" />
<httpRuntime targetFramework="4.5.1" maxRequestLength="3145728"
executionTimeout="9999999" useFullyQualifiedRedirectUrl="false"
minFreeThreads="8" minLocalRequestFreeThreads="4"
appRequestQueueLimit="1000"/>
</system.web>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="3221225472" />
</requestFiltering>
</security>
程序正常运行并显示小尺寸文件的正确消息，但对于大小为3 MB的文件，它不会显示任何错误消息，甚至内存不足。但行和文件已保存。为什么它上传文件时没有显示任何消息？
答案 0 :(得分：0)
如果我们直接操作文件流，问题可以通过以下方式解决。
public int insertStreamResponse(HttpPostedFile file)
{
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString = "Data
Source=HOME\\MSQLEXPRESS2016;Initial Catalog=Evaluation;Integrated
Security=True";
sqlConnection.Open();
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.Connection = sqlConnection;
sqlCommand.CommandType = CommandType.Text;
sqlCommand.CommandText = "insert into responses values
(ResponseId, (0X))";
SqlParameter parameter;
parameter = new System.Data.SqlClient.SqlParameter("@ResponseId",
System.Data.SqlDbType.UniqueIdentifier);
parameter.Value = this.response.ResponseId;
sqlCommand.Parameters.Add(parameter);
SqlCommand helperCommand = new SqlCommand();
sqlCommand.Transaction = sqlConnection.BeginTransaction();
sqlCommand.ExecuteNonQuery();
helperCommand.Connection = sqlConnection;
helperCommand.Transaction = sqlCommand.Transaction;
helperCommand.CommandText = "SELECT
GET_FILESTREAM_TRANSACTION_CONTEXT()";
Object transactionContext = helperCommand.ExecuteScalar();
helperCommand.CommandText = "SELECT ResponseImage.PathName() FROM
Responses WHERE [ResponseId] = @Id";
parameter = new System.Data.SqlClient.SqlParameter("@Id",
System.Data.SqlDbType.UniqueIdentifier);
helperCommand.Parameters.Add(parameter);
helperCommand.Parameters["@Id"].Value = sqlCommand.Parameters
["@ResponseId"].Value;
string filePathInServer = (string)helperCommand.ExecuteScalar();
byte[] buffer = new byte[file.ContentLength];
//read from the input file
Stream fileStream = file.InputStream;
if (fileStream.CanRead)
fileStream.Read(buffer, 0, file.ContentLength);
else return 0;
//write into the file stream
SqlFileStream sqlFileStream = new SqlFileStream(filePathInServer,
(byte[])transactionContext, System.IO.FileAccess.Write);
if (sqlFileStream.CanWrite)
sqlFileStream.Write(buffer, 0, file.ContentLength);
else return 0;
sqlCommand.Transaction.Commit();
sqlConnection.Close();
return 1;
}
答案 1 :(得分：0)
如果您使用IIS托管应用程序，则默认上传文件大小（如果为4MB）。要增加它，请在web.config中使用以下部分 -
<configuration> <system.web> <httpRuntime maxRequestLength="1048576" /> </system.web> </configuration>
对于IIS7及更高版本，您还需要添加以下行：
<system.webServer> <security> <requestFiltering> <requestLimits maxAllowedContentLength="1073741824" /> </requestFiltering> </security> </system.webServer>
注意：maxAllowedContentLength以字节为单位测量，而maxRequestLength以千字节为单位，这就是此配置示例中值不同的原因。 （两者相当于1 GB。）